The 4 km Daily Sea Ice Concentration Product, MASAM2, has had all data gaps filled. It is a now a continuous, daily time series from 02 July 2012 to the present. MASAM2 is updated daily with a 2-day lag time. For more information or to access this data set, see the MASAM2: Daily 4 km Arctic Sea Ice Concentration product page.
Data Set DOI: http://dx.doi.org/10.7265/N5ZS2TFT